.about-bg{
    background: url("../img/images/brand.jpg") 50% center / cover no-repeat;
    height: 46.875rem;
    background-repeat: no-repeat;
    background-size: 100% 100%;
    width: 100%;
}
/* 关于我们导航 */
.about-nav{
    text-align: center;
}
.about-nav div{
    display: inline-block;
    width: 8.75rem;
    line-height: 3.25rem;
    text-align: center;
    background: #f6f6f6;
    margin-right: 1.5rem;
}
.about-nav .about-active{
    background: #d98812;
    color: #fff;
}
/* 导航左边 */
.about-nav-item{
    padding-top: 2.5rem;
}
.about-item-left{
    position: relative;
    width: 50%;
    text-align: left;
    font-size: 14px;
    color: #666666;
    line-height: 30px;
    /* text-indent: 2em; */
    margin: 0 .9375rem;
}
.about-item-left::before{
    content: "";
    position: absolute;
    display: inline-block;
    width: 1px;
    height: 589px;
    background: #e5e5e5;
    right: -5.25rem;
}
.about-item-img{
    height: 20.25rem;
    margin-bottom: 2.5rem;
    background-color: #666666;
}
/* 导航右边 */
.about-item-right{
    border: 5px solid #e5e5e5;
    width: 40%;
    padding: 10px; 
    margin: 0 15px;   
}
.about-title div:first-child{
    font-size: 2rem;
    color: #333333;
    text-transform: uppercase;
}
/* 公司 */
.company{
    display: none;
}
.company .about-title div:last-child{
    font-size: 16px;
    color: #999;
    margin-top: 12px;
    line-height: 28px;
}
.company .about-list{
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    align-content: flex-start;
}
.company .about-list-item{
    width: 48%;
    display: flex;
    justify-content: space-around;
    border: 1px solid #e5e5e5;
    padding: 30px 0px;
    align-content: flex-start;
    margin-top: .9375rem;
}
.company .about-list-item .left{
    color: #999999;
    width: 40%;
    text-align: center;
    line-height: 76px;
    font-size: 3.75rem;
}
.company .about-list-item .right div{
    font-size: 13px;
    color: #666666;
    line-height: 22px;
}
.company .about-list-item .right>div:first-child{
    font-size: 18px;
    color: #333333;
    margin-bottom: 8px;
}
.company .about-list-item:nth-child(2n){
    margin-left: .9375rem;
}
.company .about-list-item:hover{
    border:1px solid #d98812;
}
.company .about-list-item:hover .left{
    color: #d98812;
}
/* 设备 */
.equipment{
    display: none;
}
.equipment .about-list{
    display: flex;
    flex-direction: row;
    align-content: flex-start;
    flex-wrap: wrap;
}
.equipment .about-list-item{
    width: 33%;
    text-align: center;
    border-right: 1px solid #dcdcdc;
    height: 140px;
    overflow: hidden;
    margin-bottom: 12px;
    padding-right: 5px;
    padding-left: 5px;
}
.equipment .right{
    height: 100px;
    background-color: #d98812;
}
.equipment .about-list-item:nth-child(3n){
    border: none;
}
/* 研发 */
.development{
    display: none;
}
.right-cotent-list{
    display: flex;
    justify-content: space-around;
}
.right-cotent-list > div{
    width: 48%;
    margin-bottom: 10px;
}
.right-cotent-list > div img{
    height: 90%;
}
/* 公司实力 */
.strength ul{
    width: 100%;
    margin: 0 auto;
    display: flex;
    justify-content: space-around;
}
.strength ul li{
    width: 15%;
}
.strength ul li div{
    font-size: 14px;
    color: #999999;
    line-height: 22px;
    margin-top: 1rem;
}
.strength-left{
    width: 50%;
    height: 600px;
    background-color: #d98812;
}
.strength-right{
    width: 50%;
}
.right-top div,.right-bottom div{
    width: 50%;
    height: 300px;
}
.right-top > div:first-child,.right-bottom > div:last-child{
    background-color: #252525;
}
.right-top > div:last-child,.right-bottom > div:first-child{
    position: relative;
}
.strength-right .right-top-txt,.strength-right .right-bottom-txt{
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translateX(-50%) translateY(-50%);
    text-align: left;
    width: 65%;
    height: 61px;
    font-size: 32px;
}
.strength-right .right-bottom-txt{
    color: white;
}
.right-top-txt::before,.right-bottom-txt::before{
    content: "";
    position: absolute;
    display: inline-block;
    width: 34px;
    height: 2px;
    background: #000000;
    bottom: 0px;
}
.strength-right .right-bottom-txt::before{
    background: white;
}
.brand-left,.brand-right{
    width: 50%;
    height: 540px;
}
.brand-left{
    position: relative;
}
.brand-left::before{
    content: "";
    position: absolute;
    display: inline-block;
    width: 83px;
    height: 170px;
    background: url('../img/images/bn28.png') no-repeat 50%;
    top: 50%;
    left: 100%;
    transform: translateX(-50%) translateY(-50%);
    z-index: 50;
}
.brand-right{
    background-color: thistle;
}
.left-top-txt{
    position: absolute;
    left: 60%;
    top: 0;
    transform: translateX(-50%) translateY(10%);
    width: 70%;
    text-align: left;
}
.left-top-txt div:nth-child(1){
    font-size: 32px;
    color: #333333;
    position: relative;
    padding-bottom: 20px;
    margin-bottom: 25px;
}
.left-top-txt div:nth-child(1)::before{
    content: "";
    position: absolute;
    display: inline-block;
    width: 34px;
    height: 2px;
    background: #000000;
    bottom: 0;
}
.left-top-txt div:nth-child(2){
    text-indent:2em;
    color: #666666;
    font-size: 14px;
    line-height: 24px;
    margin: 20px 0;
}
/* 资质证书 */
.patents ul{
    display: flex;
    justify-content: space-around;
}
.patents ul li{
    background-color: #d98812;
    width: 24%;
    height: 330px;
}

@media (max-width:1200px) {
    .about-bg{
        height: 26.875rem;
    }
    .about-item-left::before{
        display: none;
    }
    .company .about-list-item{
        display: block;
        width: 47%;
    }
    .company .about-list-item .left{
        margin: 0 auto;
    }
}

@media (max-width:768px){
    /* 关于我们 */
    .about-nav{
        margin-top: 1.25rem;
    }
    .about-item-left,.about-item-right{
        float: none;
        width: 100%;
    }
    .about-nav-item{
        padding: 2.5rem 15px 0 15px;
    }
    .about-item-left,.about-item-right{
        margin: 0;
    }
    /* 公司介绍 */
    .company .about-list-item:nth-child(2n){
        margin-left: 1.9375rem;
    }
    /* 公司实力 */
    .strength ul{
        display: block;
        white-space: nowrap;
        margin-top: 20px;
        width: 100%;
        animation: strength-slider  12s infinite ease;
    }
    .strength ul li{
        display: inline-block;
        width: 45%;
        margin-left: 1.6rem;
    }
    .strength ul li div{
        white-space:normal;
    }


    .strength .fl,.strength .fr{
        float: none;
    }
    .strength-left,.strength-right{
        width: 100%;
    }
    .right-top div, .right-bottom div{
        width: 100%;
    }
    .brand-left, .brand-right{
        width: 100%;
        height: 320px;
    }
    .brand-left::before{
        display: none;
    }
    .left-top-txt{
        left: 50%;
    }
    @keyframes strength-slider {
        0% {transform: translateX(0%);}
        10% {transform: translateX(-50%);}
        20% {transform: translateX(-50%);}
        30% {transform: translateX(-100%);}
        40% {transform: translateX(-100%);}
        50% {transform: translateX(-150%);}
        60% {transform: translateX(-150%);}
        80% {transform: translateX(-200%);}
        90% {transform: translateX(-200%);}
        100% {transform: translateX(-200%);}
    }
    /* 资质证书 */
    .patents ul{
        align-content: flex-start;
        flex-wrap: wrap;
    }
    .patents ul li{
        width: 48%;
        height: 240px;
        margin-top: 10px;
    }
}
.about-active{
    display: block;
}


